Niobium pentoxide nanoparticles decorated graphene as electrode material in aqueous-based supercapacitors: Accurate determination of the working voltage window and the analysis of the distributed capacitance in the time domain

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dc.contributor.authorVicentini R.
dc.contributor.authorBeraldo R.
dc.contributor.authorAguiar J.P.
dc.contributor.authorOliveira F.E.
dc.contributor.authorRufino F.C.
dc.contributor.authorLarrude D.R.G.
dc.contributor.authorDa Silva L.M.
dc.contributor.authorZanin H.
dc.date.accessioned2024-03-12T19:18:10Z
dc.date.available2024-03-12T19:18:10Z
dc.date.issued2021
dc.description.abstract© 2021This study report on the physicochemical behavior exhibited by the composite material based on niobium pentoxide nanoparticles (Nb2O5) decorated graphene (Gr) and their promising electrochemical properties in neutral aqueous supercapacitors (SCs). The Nb2O5@Gr composite showed outstanding properties where Gr contributes to electrochemical stability and ultra-fast electronic transport, while Nb2O5 offers fast and reversible solid-state surface redox reactions. Nb2O5 also works as a protective surface blocker for the carbon scaffold. A new methodology is proposed to verify the electrocatalytic activity for electrolyte decomposition in SCs. It was verified the electrocatalytic activity decreased by 7% for water splitting in the presence of Nb2O5, which boosted the overall device characteristics for the energy-storage properties. The Nb2O5@Gr composite electrode increased the energy and power densities from 4 to 18 µWh cm−3 and 0.5 to 2 µW cm−3, respectively. In addition, the cell voltage increased from 0.4 to 0.6 V, while the areal capacitance changed from 27.5 to 150 µF cm−2, and the equivalent series resistance (ESR) underwent a three-fold reduction. These promising findings are associated with synergism between the Nb2O5 nanoparticles, which conferred a pronounced pseudocapacitive contribution, while the Gr worked as an efficient nanosized and localized current collector at the active redox surface sites. These results encourage future works to explore the exciting properties of the Nb2O5@Gr composite electrode in aqueous-based SCs. The distributed capacitance in the time domain was calculated to discriminate the electrostatic and faradaic charge-storage mechanisms occurring in electrical double-layer capacitors and pseudocapacitor devices, respectively.
dc.description.volume44
dc.identifier.doi10.1016/j.est.2021.103371
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34537
dc.relation.ispartofJournal of Energy Storage
dc.rightsAcesso Restrito
dc.subject.otherlanguageAqueous-based supercapacitors
dc.subject.otherlanguageDistributed capacitance in the time domain
dc.subject.otherlanguageElectrospray synthesis method
dc.subject.otherlanguageGraphene scaffold
dc.subject.otherlanguageNiobium pentoxide
dc.titleNiobium pentoxide nanoparticles decorated graphene as electrode material in aqueous-based supercapacitors: Accurate determination of the working voltage window and the analysis of the distributed capacitance in the time domain
dc.typeArtigo
local.scopus.citations24
local.scopus.eid2-s2.0-85122705750
local.scopus.subjectAqueous-based supercapacitor
local.scopus.subjectDistributed capacitance
local.scopus.subjectDistributed capacitance in the time domain
local.scopus.subjectElectrospray synthesis method
local.scopus.subjectElectrosprays
local.scopus.subjectGraphene composites
local.scopus.subjectGraphene scaffold
local.scopus.subjectNiobium pentoxide
local.scopus.subjectSynthesis method
local.scopus.updated2024-12-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85122705750&origin=inward
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